As for the accidental physical part...
It's done, right or wrong, under whatever circumstances....
But in her mind just remember she's kinda shaken and that "Safe" feeling being with you is a bit shaken up... Actions always speak louder than words, under most circumstances... If you want to move past that, then accept it, apologize and move on, if she's willing to move forward, then you can rebuilding some of the stuff you two need, communication, trust, a better understanding of the dynamics that make you two work...
I break between two people is always a good thing, why? I makes us take a different perspective of ourselves and our partners and even makes us more appreciative of them at times.